Am 30.03.2015 um 19:58 schrieb Aaron Meurer:
symbols() supports commas, so an easy thing to do here is to use the
form symbols(' t, w, x, y, z, n, k, m, p, i'), so that the left-hand
side of the assignment exactly matches the right-hand side.
Ah, I knew it could do commas but I didn't know that it allows the
comma-plus-space combination as well.
That's going to make replacing `from sympy.abc import ...` with
`symbols('...')` easy enough (and I think I'll fix up any existing calls
as well, just to set the precedent).
Question is: Is this what we want?
grep reports 2200+ mentions of 'abc' in SymPy, that's an awful lot of
work, both for fixing and for review.
My personal main motive that I even started actually doing this has been
to get some more warnings out of the system - static analysis does not
know about the symbols that the exec calls in sympy.abc generates.
I could imagine fixing that by rewriting sympy.abc as
a = Symbol('a')
b = Symbol('b')
...
z = Symbol('z')
A = Symbol('A')
B = Symbol('B')
...
Z = Symbol('Z')
from sympy.printing.pretty.pretty_sombology import g, G
alpha = Symbol(g('alpha'))
beta = Symbol(g('beta'))
...
omega = Symbol(g('omega'))
ALPHA = Symbol(G('ALPHA'))
ΒETA = Symbol(G('BETA'))
...
OMEGA = Symbol(G('OMEGA'))
It's dull, it's dumb, but it gets the work done, and this needs to be
maintained so rarely that it shouldn't be a problem.
It should also make the import of sympy.abc fast (I guess importing
sympy.abc is slow because module initialization runs ~100 one-liners
through the Python compiler, though I haven't checked that it is indeed
as slow as `sympy/__init__.py` suggests).
However, that's just something that I came up with tonight, I'll be
happy to follow whatever course people see as best.
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